// Copyright 2012 dmitry.a.novikov@gmail.com
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// CnsZ::Object declaration


#ifndef _INCLUDED_CNZ_STREAM_H_
#define _INCLUDED_CNZ_STREAM_H_

#include "exception.h"

namespace CnsZ {

  class EndOfFile : public Exception {
  public:
    EndOfFile() {}
  };

  class Stream : public Object {
  public:
    DECLARE_CNSZ_CLASS(Stream);
    virtual void wrBytes(size_t num, const void* bytes) = 0;
    virtual void rdBytes(size_t num, void* buffer) = 0;
    virtual void wrBytes(size_t num, Stream* other) = 0;
    virtual size_t forward(size_t offset) = 0;
    virtual size_t back(size_t offset) = 0;
    virtual void seek(size_t pos) = 0;
    virtual size_t tell() const = 0;
    virtual bool eof() const = 0;

    static P<Stream> NewMemoryPages(size_t pagesize);
    static P<Stream> NewFlatMemory(Byte* buffer, size_t buffersize);
  };
}

#endif //#ifndef _INCLUDED_CNZ_STREAM_H_